Makrie, I may have replied a little to quickly. I have looked at the wiring diagrams for both 64 and 65, and both show two wires to the ammeter. I haven't had a chance to look further to see what the difference is in the rest of the circuit, but will do so.
When I purchased my 64 in about 2000, the ammeter showed signs of overheating and smoke damage. I replaced it and did quite a bit of wire repair caused by obvious overheating. The forums of the time had quite a bit of information on the problems caused by all the output of the alternator being fed through the ammeter and Ford changing the design for 65.
I also recall an article about modifying a 64 to solve the problem, but I haven't yet found it (still looking).
Perhaps someone else can give some information on this.
I'll get back to you
Terry
64HT
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